QGraphicsSvgItem warning when loading certain svg

When creating QGraphicsSvgItem the following warning sometimes appears :
QFont::setPointSize: Point size <= 0 (0), must be greater than 0

The attached osa_desktop.svg file triggers the warning.
I removed the "PONY" path which is located at the bottom of the screen picture and the warning
does not appear (attached file osa_desktop_modified.svg)

Here is a small main to reproduce the issue :

#include <QtGui/QApplication>
#include <QtGui/QGraphicsView>
#include <QtGui/QGraphicsScene>
#include <QtSvg/QGraphicsSvgItem>

int main(int argc, char ** argv)
{
        QApplication app(argc, argv);
        QGraphicsScene scene;
        QGraphicsView view(&scene);
        qDebug("original svg");
        scene.addItem(new QGraphicsSvgItem("osa_desktop.svg"));
        qDebug("modified svg");
        scene.addItem(new QGraphicsSvgItem("osa_desktop_modified.svg"));
        return app.exec();
}

Running this program outputs the following :
original svg
QFont::setPointSize: Point size <= 0 (0), must be greater than 0
modified svg

We were already using this svg file with Qt 4.5.3 and there was no warning.

The original icon is from the OSA Icon Library (http://www.opensecurityarchitecture.org/cms/library/icon-library)